Jupiter's moon Ganymede, is larger than the planet Mercury!
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The heart of an astronaut actually gets smaller when in outer space.
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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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There is a mass reservoir of water floating in space that is 100,000 times bigger than our sun and holds 140 trillion times more water than all of our oceans.
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Lightning strikes about 6,000 times per minute on this planet!
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Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
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There's a mysterious dwarf planet between Mars and Jupiter called 'Ceres' which has never been visited by spacecraft or photographed in detail, however, Earth-bound telescopes reveal a large bright shining spot on the surface of this planet, the origin and nature of which are unknown.
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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
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